@Bonnie Sposato -  I believe that your only option here would be to enable the grid mode of your frame. However, you will likely find that it won’t be perfect. Here it is in action when growing a kanban vertically:

If you would like to see truly auto-expanding frames, I’d recommend adding this as an Idea in the Wish List category by following the guidelines here: Wish List: Everything You Need to Know. If you do create a Wish List Idea post, I would also recommend that you post a link to it back here, so that future readers of this post can quickly get to and vote for your Idea.